package 多次撤销;

/**
 * @author 赵希奥
 * @date 2022/4/20 23:30
 * @gitHub https://github.com/CKXGZXA
 * @gitee https://gitee.com/ckxgzxa
 * @description:
 */
public class Client {
    private static int index = -1;  // 定义一个索引来记录当前位置所在的位置
    private static MementoCaretaker mc = new MementoCaretaker();

    public static void main(String[] args) {
        Chessman chess = new Chessman("車", 1, 1);
        play(chess);
        chess.setY(4);
        play(chess);
        chess.setX(5);
        play(chess);
        undo(chess, index);
        undo(chess, index);
        redo(chess, index);
        redo(chess, index);
    }

    // 下棋
    public static void play(Chessman chess) {
        mc.setMemento(chess.save());
        index ++;
        System.out.println("棋子" + chess.getLabel() + "的位置是：第" + chess.getX() + "行第" + chess.getY() + "列");
    }

    // 悔棋
    public static void undo(Chessman chess, int i) {
        System.out.println("******悔棋******");
        index--;
        chess.restore(mc.getMemento(i-1));  //撤销到上一个备忘录
        System.out.println("棋子" + chess.getLabel() + "的位置是：第" + chess.getX() + "行第" + chess.getY() + "列");
    }

    //撤销悔棋
    public static void redo(Chessman chess, int i) {
        System.out.println("******撤销悔棋******");
        index++;
        chess.restore(mc.getMemento(i+1));  //恢复到下一个备忘录
        System.out.println("棋子" + chess.getLabel() + "的位置是：第" + chess.getX() + "行第" + chess.getY() + "列");
    }
}
